Symmetricom Time Server Manual Do Utilizador

C

TIME protocol provides a site-independent, machine readable date and time.  The TIME 
service sends back to the originating source the UTC time in seconds since midnight on 
January 1, 1900.

This protocol may be used either above the Transmission Control Protocol (TCP) or above 
the User Datagram Protocol (UDP).

When used via UDP, the TIME service works as follows:

Server:Listen on port 37 (45 octal).

Client:Send an empty datagram to port 37.

Server:Send a datagram containing the UTC time as a 32 bit binary number.

Client:Receive the TIME datagram.

The server listens for a datagram on port 37.  When a datagram arrives, the server returns 
a datagram containing the 32-bit time value.  If the server is unable to determine the time 
at its site, it should discard the arriving datagram and make no reply.

The time is the number of seconds since 00:00 (midnight) 1 January 1900 UTC, such that 
the time 1 is 12:00:01 AM on January 1, 1900 UTC; this base will serve until the year 
2036.